File:Pentlandite-pyrrhotite (late Paleoproterozoic, 1.85 Ga; Sudbury Impact Structure, Ontario, Canada) 2 (18278629703).jpg
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DescriptionPentlandite-pyrrhotite (late Paleoproterozoic, 1.85 Ga; Sudbury Impact Structure, Ontario, Canada) 2 (18278629703).jpg |
Pentlandite-pyrrhotite from the Sudbury Impact Structure in Ontario, Canada. (CMNH 12045, Cleveland Museum of Natural History, Cleveland, Ohio, USA) Pentlandite is the principal nickel ore mineral. It is a brassy gold-colored nickel iron sulfide (Ni,Fe)9S8). It's similar in its physical properties to other brassy gold-colored sulfide minerals such as pyrite, pyrrhotite, and chalcopyrite. Pentlandite has a metallic luster, a brassy-bronze color, a light bronzish-brown streak, has a hardness of 3.5 to 4, is not magnetic, has no cleavage, and is moderately heavy for its size. Pentlandite is typically found closely intermingled with pyrrhotite (Fe1-xS), as in the examples shown below. Pentlandite crystals are rare, and it usually occurs in massive to granular form. Pentlandite can be found with other metallic sulfide minerals, particularly in some mafic and ultramafic intrusive igneous rocks. The Sudbury Impact Structure of Ontario is a world-class locality for pentlandite and other metallic sulfides. The massive sulfide rock shown above is from Sudbury. The Sudbury Complex (Sudbury Basin) in southeastern Canada has intrigued geologists for decades, and not just due to the tremendous economic value of the area’s mineral deposits. Sudbury is one of the largest preserved impact structures on Earth. The impact occurred ~1.85 billion years ago, during the late Paleoproterozoic. The Sudbury Impact Structure is no longer circular or subcircular in shape, however - it's been compessed into a stretched-egg shape from an ancient continental collision event. This massive sulfide specimen consists of pentlandite ((Ni,Fe)9S8 - nickel iron sulfide) and pyrrhotite (Fe(1-x)S - imperfect iron monosulfide). Sulfide mineralization likely occurred during or very soon after the Sudbury impact event at 1.85 billion years (Paleoproterozoic). Photo gallery of pentlandite: www.mindat.org/gallery.php?min=3155 |
Date | |
Source | Pentlandite-pyrrhotite (late Paleoproterozoic, 1.85 Ga; Sudbury Impact Structure, Ontario, Canada) 2 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://flickr.com/photos/47445767@N05/18278629703. It was reviewed on 27 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
27 July 2015
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Camera manufacturer | Canon |
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Exposure time | 1/40 sec (0.025) |
F-number | f/4.5 |
ISO speed rating | 320 |
Date and time of data generation | 14:39, 3 March 2013 |
Lens focal length | 14.3 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 15:20, 17 June 2015 |
Y and C positioning | Centered |
Exif version | 2.21 |
Date and time of digitizing | 14:39, 3 March 2013 |
Meaning of each component |
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APEX aperture | 4.3398500267809 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4.3398500267809 APEX (f/4.5) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905405405 |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 11:20, 17 June 2015 |
Unique ID of original document | C9C7E5F0F0D563EA12B8530A81183C65 |